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When writing PHP programs, it is often necessary to perform case conversion operations on strings. The following are several commonly used case conversion functions:
Syntax: strtoupper( string $string)
Example:
$str = 'Hello World'; echo strtoupper($str); // 输出 HELLO WORLD
Syntax: strtolower(string $string)
Example:
$str = 'Hello World'; echo strtolower($str); // 输出 hello world
Syntax: ucfirst(string $string)
Example:
$str = 'hello world'; echo ucfirst($str); // 输出 Hello world
Syntax: ucwords(string $string)
Example:
$str = 'hello world'; echo ucwords($str); // 输出 Hello World
These functions are very useful during program development, It can help us quickly deal with case problems in strings and improve the efficiency of writing code. In addition, PHP also supports other string conversion functions, such as:
Syntax: mb_strtolower(string $string [, string $encoding = mb_internal_encoding() ])
Syntax: mb_strtoupper(string $string [, string $encoding = mb_internal_encoding() ])
In general, using these case conversion functions in PHP allows us to process strings more conveniently and improve the readability and maintainability of the code.
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